Michael a



(ModeL) M. A. FOSTER.

GRATE BAR ATTACHMENT FOR FURNACES.

Patented Jan. 6, 1885.

Aftes't:

UNITED STATES PATENT OFFICE.

MICHAEL A. FOSTER, OF ST. LOUIS, MISSOURI.

GRATE-BAR ATTACHMENT FOR FURNACES.

SPECIFICATION forming part of Letters Patent No. 310,194, dated January 6, 1885.

Application filed June 9, 1884.

T0 (LZZ ZUhO'IH/ itmay concern:

Be it known that I, MIcIIAnL A. Fos'rnn, of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Iniprovement in GrateBar Attachments for Furnaces, &c., of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, and in which Figure 1 is a perspective view of agratebar with my attachment applied. Fig. 2 is a similar view with the attachment removed. Fig. 3 is a vertical longitudinal section of the attachment, taken on line 3 3, Fig. 4.. Fig. 4 is a transverse section taken on line 4. 4, Fig. 3. Fig. 5 is a front "iew of a slightlymodified form of the attachment. Fig. 6 is a vertical longitudinal section taken on line 6 6, Fig. 5.

My invention relates to an improvement in grate-bars that can be applied to locomotive or other furnaces, as desired; and my invention consists in features of novelty, hereinafter fully described, and pointed out in the claims.

Referring to the drawings, A represents a grate-bar having side flanges or projections,

against which similar lugs or flanges on the adjacent bars fit, and which keep the bars from being warped or drawn out of shape by the heat. This bar has a socket or opening, 1;, to receive a square or other shaped air pipe or flue, C, the lower end of which extends below the grate bar, so as to project into the ash'pit when the bar is in place. It is held from moving downward too far in the socket by shoulders D thereon that fit against the bar, or by other suitable means. The lower end of the pipe has a mouth, I, for the entrance of air from the ash -pit. \Vithin the pipe are cross-partitions J, which hold the pipe in shape and prevent it from being warped by the fire. A slide-damper, L, may be applied to the pipe to regulate the pasage of air. The upper end of the pipe has a hood or cap, N, of fireclay or other suitable material, which will not be affected by the heat in the fire-box. This hood fits over the upper end of the pipe or flue and protects it from the fire, preventing it from being burned and drawn out of shape. The cap has a mouth, 0, for the escape of the air, and is preferablypresented toward the length of the bar, so that the air will be discharged directly over the fire.

()Iodel.)

I have shown the sockets B at one end of the bar; but they may be at both ends or may be at the sides. These sockets or openings B weaken the gratebars, so that it is desirable and really necessary to strengthen the bars by flanges or ribs 13, as shown in Figs. 1 and 2, to keep them from breaking at these points. For locomotives the mouth I would preferably be at one side of the pipe presenting forward so that the air will be forced through the pipe when the locomotive is moving; but in stationary furnaces the mouth would preferably be at thebot-tom of the pipe. as shown in Figs. 5 and-6l In these Figs. 5 and 6 the upper end of the pipe fiares outward and the sides of the fire-clay top flare inward, so that when the top is slid on from the back of the pipe it will be held in place. (See Fig. 5.) The top of this pipe has open vertical partitions P, between which projections T on the cap fit, and the air-outlet openings or months 0 are made between these partitions.

I claim as my invention 1. A grate bar having strengthening'ribs B and a socket or opening to receive an air pipe or flue, for the purpose mentioned.

2. The combination of the grate-bar and air pipe or fine, the former having a socket to receive the latter, and the latter having strengthening-partitions, for the purpose mentioned.

3. The combination of the grate-bar and air pipe or fine, the former having a socket to receive the latter, and the latter having a fireclay cap or hood, for the purpose set forth.

4. The combination of the grate-bar and air pipe or flue, the former having a socket to receive the latter, and the latter having a damper, strengthening-partitions, and a fire-clay hood or cap, all arranged and operating sub stantially as and for the purpose set forth.

5. The combination of the grate-bar and air pipe or fine, the former having a socket to receive the latter, and the latter fitting in the socket and having flanges D and side mouth or opening,I, substantially as shown and described, for the purpose set forth.

MICHAEL A. FOSTER.

In presence of .Gno. H. KNIGHT,

SAML. KNIGHT. 

